Transparent pane having a heatable coating

Patent metadata

Field	Value
Publication number	US-10336298-B2
Application number	US-201113704982-A
Country	US
Kind code	B2
Filing date	Jul 6, 2011
Priority date	Jul 7, 2010
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A transparent pane with a conductive coating extending at least over a part of the transparent pane surface, in particular over a visual field of the transparent pane is described. The conductive coating is electrically connected to at least two strip-shaped bus bars such that after application of a supply voltage, a current flows over a heating field formed by the conductive coating. The conductive coating has an electrical resistance such that upon application of a supply voltage in the range from more than 100 volts to 400 volts, a heating output from the heating field is in the range from 300 watt/m2 to 1000 watt/m2. The at least two strip-shaped bus bars have a maximum width of less than 5 mm and are dimensioned such that a maximum electrical power loss per unit of length is 10 watt/m. Moreover, the at least two strip-shaped bus bars have a specific resistivity ranging from 2 μohm·cm to 4 μohm·cm.

First claim

The invention claimed is:

1. A transparent pane, comprising:
a first pane having a surface;
a conductive coating extending at least over a part of the surface of the first pane; and
at least two strip-shaped bus bars on the first pane,
wherein the conductive coating is electrically connected to the at least two strip-shaped bus bars, wherein the at least two strip-shaped bus bars are configured to receive a supply voltage from a power source and wherein after application of the supply voltage, a current flows over a heating field formed between the at least two strip-shaped bus bars,
wherein the conductive coating has an electrical resistance such that upon application of the supply voltage in a range between more than 100 volts and 400 volts, a heating output from the heating field is in a range from 300 watt/m 2 to 1000 watt/m 2 ,
wherein the conductive coating has an electrical resistance per surface unit in a range from more than 100 ohms/square meter to 200 ohms/square meter,
wherein the at least two strip-shaped bus bars have at least in sections of the at least two strip-shaped bus bars, a maximum width of less than 5 mm and a width of the at least two strip-shaped bus bars being dimensioned such that a maximum electrical power loss per unit of length is 10 watt/m,
wherein a cross-sectional area along the width and perpendicular to a length of the at least two strip-shaped bus bars is in a range from 0.01 to 1 mm 2 , and
wherein the at least two strip-shaped bus bars having a specific resistivity in a range from 2 μohm·cm to 4 μohm·cm.

2. The transparent pane according to claim 1 , wherein the at least two strip-shaped bus bars have at least in sections of the at least two strip-shaped bus bars, a width in a range from 1 mm to less than 5 mm.

3. The transparent pane according to claim 1 , wherein the at least two strip-shaped bus bars have an electrical resistance per unit of length in a range from 0.15 ohm/m to 4 ohm/m.

4. The transparent pane according to claim 1 , wherein the conductive coating has an electrical resistance such that a current flowing through the heating field has a maximum magnitude of 5 A.

5. The transparent pane according to claim 1 , wherein the at least two strip-shaped bus bars are adapted to be electrically contacted in a common connector zone by connector conductors.

6. The transparent pane according to claim 1 , wherein the heating field is subdivided by one or a plurality of decoated zones into a plurality of segments galvanically separated from each other, wherein the plurality of segments are serially connected to each other by the at least two strip-shaped bus bars.

7. The transparent pane according to claim 1 , wherein the heating field is subdivided by one or a plurality of decoated zones into a plurality of segments galvanically connected to each other in series, wherein a current path between the at least two strip-shaped bus bars is lengthened relative to a current path without decoated zones.

8. The transparent pane according to claim 7 , wherein the plurality of decoated zones is implemented as parallel lines.

9. The transparent pane according to claim 7 , wherein the plurality of decoated zones form a staggered pattern, wherein zone ends of adjacent decoated zones face opposite edges of the transparent pane.

10. The transparent pane according to claim 1 , wherein the at least two strip-shaped bus bars are produced by printing a metallic printing paste onto the conductive coating.

11. The transparent pane according to claim 10 , wherein the at least two strip-shaped bus bars are produced by using a screen-printing method.

12. The transparent pane according to claim 1 , wherein the at least two strip-shaped bus bars are produced in form of prefabricated metal strips connected to the conductive coating, the prefabricated metal strips being affixed on the conductive coating by a conductive adhesive.

13. The transparent pane according to claim 1 , further comprising a second pane having a surface, wherein the first pane and the second pane are bonded to each other by a thermoplastic adhesive layer, wherein the conductive coating is situated on at least one surface of the first pane and the second pane or on a surface of a carrier disposed between the first pane and the second pane.

14. The transparent pane according to claim 1 , wherein the transparent pane is implemented as a motor vehicle windshield, wherein a bus bar of the at least two strip-shaped bus bars disposed on a lower edge of the transparent pane is situated under a resting or parked position of windshield wipers provided to wipe the transparent pane.

15. The transparent pane according to claim 1 , wherein the transparent pane is implemented as a motor vehicle windshield, wherein the at least two strip-shaped bus bars are disposed on a lateral edge of the first pane.

16. The transparent pane according to claim 15 , wherein the at least two strip-shaped bus bars are covered by at least one opaque covering element.

17. A method comprising:
using the transparent pane according to claim 1 as a functional individual piece, as a built-in part in furniture, devices, or buildings, as well as in means of transportation on land, in air, or on water.

18. The method according to claim 17 , wherein the transparent pane is used as a windshield, rear window, side window, and/or glass roof in means for transportation.

19. The method according to claim 18 , wherein the means for transportation is a motor vehicle.

Assignees

• Lisinski Susanne
• Melcher Martin
• Offermann Volkmar
• Schlarb Andreas
• Saint Gobain

Inventors

• Lisinski Susanne
• Melcher Martin
• Offermann Volkmar
• Schlarb Andreas

Classifications

• B32B17/10174

  Coatings of a metallic or dielectric material on a constituent layer of glass or polymer · CPC title

• H05B3/86

  the heating conductors being embedded in the transparent or reflecting material {(H05B3/845 takes precedence)} · CPC title

• B60S1/026 Primary

  using electrical means · CPC title

• H05B3/84 Primary

  Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields · CPC title

• B32B17/10192

  patterned in the form of columns or grids · CPC title